Email Sharp Shooter Supply and tell them you want a long action 223 conversion kit. It'll be a trued short action bolt head and another part that makes it work safely in a long action that I can't recall its name.
I also think you can order a dedicated long action 378 bolt head from PTG.
Barring that, you might find a old factory LA/378 bolt head...but they go fast in the classifieds due to being kinda rare.
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